CVE-2026-76788 Stack out-of-bounds write in the OSDP Control Panel reply parser

The OSDP Control Panel reply parser cpdecoderesponse in subsys/mgmt/osdp/src/osdpcp.c decodes replies from a Peripheral Device into a stack-allocated struct osdpevent. For the REPLYKEYPPAD and REPLYRAW reply types, the payload length is taken from the received frame and the only validation...

CVE-2026-76788

The Zephyr RTOS OSDP Control Panel reply parser contains a stack out-of-bounds write in cp_decode_response() within subsys/mgmt/osdp/src/osdp_cp.c. When processing REPLY_KEYPPAD or REPLY_RAW types, the parser fails to validate that the payload length stays within the fixed 64-byte OSDP_EVENT_MAX_...